Perform the operation indicated. Simplify.
+ 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Collect like terms and write in descending order.7x7 + 3x7 - 8x7
A. -168x7 B. 2x21 C. Can't be simplified D. 2x7
Mathematics
Solve.x - y + z = 2x + y + z = -6x + y - z = -12
A. (3, -5, -4) B. (3, -4, -5) C. (-5, 3, -4) D. (-5, -4, 3)
Mathematics
Solve.A weather forecaster predicts that the temperature will drop 4 degrees each hour for the next 5 hours. If the temperature is 8 degrees before the temperature starts falling, what is the temperature after the drop?
A. 20° B. -1° C. -12° D. -20°
Mathematics
Solve the equation. Express irrational answers in exact form and as a decimal rounded to 3 decimal places.ln x + ln (x + 4) = -5
A. 
? -4.002
B. 
? 0.002
C. -4 + 
? 0.003
D. 
? 2.001
Mathematics